630 A. JEJ. Yerrill — Turbellarla, Nemertina^ and 



more incurved. In each fascicle there is usually one slender, needle- 

 like, acute seta, nearly as long as the others. 



The oesophagus is rather short, but ^ longer than the stomach, 

 with a large tooth. The stomach is short elliptical, as broad as long^ 

 and occupies but one segment. The parapodia and setae are promi- 

 nent, especially posteriorly, where they are as long as the breadth 

 of the body ; anteriorly they are about 4^ its breadth. 



Length, 3"™; diameter, .2'"'^. 



Only one specimen was found. 



Autolytus (Proceraea) simplex, sp. nov. 



A small, slender species with long slender tentacle and antennae, 

 and three pairs of cirri that are still longer, other dorsal cirri short. 

 Head small and rounded; eyes black, rather large, those of the same 

 side in contact or nearly so, the anterior a little larger ; a few black 

 pigment cells at the front border of the head may represent a pair 

 of ocelli. Palpi small, rounded, united. 



Antennae and tentacle similar, long, slender, smooth, scarcely 

 tapex'ed, with slight indications of articulations, three or four times- 

 as long as the head and palpi combined. Tentacular cirri similar 

 to the tentacle in size and form, the upper ones nearly twice as long ; 

 lower ones about equal to the antennae. First and second dorsal 

 cirri are like the upper tentacular cirrus, or a little longer. All the 

 succeeding cirri are small and very short, the length from \ to \ the 

 diameter of the body. Caudal cirri long and tapered, distinctly 

 annulated. 



The setae are all essentially alike ; anteriorly there are 6-8 in a 

 fascicle, with the stems slender and subclavate, the blades are small 

 and very short, ratio about as 1 : 1^ to l^^ ; their tips are slightly 

 incurved and minutely bidentate at the end. 



The oesophagus is long, slender, and folded, occupying 11 seg- 

 ments. The stomach occupies 5 segments ; it is rather short, cylin- 

 drical, narrowed at both ends, with numerous close, narrow rows of 

 glands. 



The bases of the parapodia back of the stomach are swollen, 

 rounded, and dark colored, causing a conspicuous lateral row of 

 spots on each side, which extend forward nearly to the head. 



A constriction occurs at the 40th segment, indicating the forma- 

 tion there of the head of a sexual zoOid, which has two small 

 eye-specks, but no special appendages are present. The zooid con- 

 tains 21 segments and is already full of eggs. 



Length, 5'""^ ; diameter, .25"^ 



:mm 



